Q. An object is projected horizontally from a top of the tower of height h. the line joining the point of projection and point of striking on the ground makes an angle 45° with ground, then with what velocity the object strikes the ground

(a) $ \displaystyle \sqrt {\frac{11 g h}{2}} $

(b) $\displaystyle \sqrt {\frac{9 g h}{2}} $

(c) $ \displaystyle \sqrt {\frac{7 g h}{2}} $

(d) $ \displaystyle \sqrt {\frac{5 g h}{2}} $

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Ans: (d)